David Letterman has signed on to host CBS’ Late Show for at least another four years.

The BBC reports that the deal will keep Letterman, 59, on the show through the 2009-2010 season. That means he’ll outlast competitor Jay Leno, who is leaving NBC’s Tonight Show in 2009.

While Conan O’Brien has already been confirmed to replace Leno, there is no indication of who may end up filling Letterman’s role when he eventually leaves the program.

Letterman has suffered some health problems over his 13 years with the Late Show. In 2000, he underwent heart surgery, and in 2003, he came down with shingles, keeping him off the show for a short time.






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